Marcus m



No. 617,666. menten mmm, |899.

M. m. wHlPPLl-z, 2a.

KNIFE ADJUSTER.

(Application led July 28, 1898.)

(No Model.)

JM 2 ed Ailnrran Strains- 'PATENT Kairi-fanatisme..

EFi'lOxiformng part of Letters Patent No. Gi, dated January '1.6, N39@ Application filed July 23, 1898.

To a/ZZ who/t it muy concern:

Be it known that l, MARCUS M. WHIPPLE, 2d, of Sharon, in the county of Norfolk and I State of Massachusetts, have invented anew and useful Improvement in Knife-Adjusters; and l hereby declare that the following is a full, clear, and exact description of the salue, reference being had to the aecompanyingr drawings, formingY part of this specification. This invent-ion has reference to knife-ad justers for leather-splitting machines.

.The object of .the invention is to so cou- -struct the knife-jaws of leather-splitti ng may ehines that much of the wear on the jaws is prevented by reducing the vibration of the knife.

Another object of the invention is to adjustthe knifewith relation to the back plate, whereby the action of the knife-edge on the leather is nrade more accurate and the stoppage of the machine by reason of the knife riding,` under the back plate is obviated, as well as the wear on the parts of the machine resulting therefrom.

The invention consists in an upper .jaw provided with independentl y-ad j ustable hea-ring portions which bear ou the surface of the back plate and of the knife. y

The invention also consists in the construction el' the upper jaw in combination with the adjustable sections.

lhe invention still further consists in such other novel features of construction and coinbination of parts as shall hereinafter b'e more "i'uily described, and pointed out in the claims. Figure l represents a vertical sectional view of the knife-jaws of a leather-splittiug'` inachine with the feed and gage' rolls and a piece of leather passing,` therethrough and being cut by the knife. Fig. 2 represents a similar View, on an enlarged scale, of portions of the saine. Fig. 23 represents 'a bottom plan view ofthe upper jaw, showing one of the adjustable sections removed.

Similar numbers of reference designate corresponding parts throughout.

In leather-splitting machines of this nature the knife consists of an endless baud of steely which passes over guides' and lengthwise be- 5e` tween a pair of jaws adjusted as closely to the movable knife as possible without obstructing the driving el' the same. 'lhis is sena No'. 686,679. ou man.)

necessary by rea-son of the accuracy with which the edge of the knife should follow a straight line as the leather is carried forward to the knife. Notwithstanding the hearing of the jaws on the knife it is found that as the knife is driven in its course constant vi.- bratieu of the knife results .from the nature of its material and from the manner in which it is mounted and driven. This vibration of the knife unduly wears the jaw-plates, necessitating the mounting of the jaws so that their front edges may be brought cioser together. The jaws are also worn uneveniy, which prevents their accurate adjustment,

and the knife has a tendency to ride under .y

the hack plate and between the saine and the lower jaw, requiring the stopping of the inaohiue and complete rezuljustiueutof lhejaws and knife. p

In carrying my invention into practice I ferm in the upper jaw 5 and 4its plate li a series of eoncavities 7 7, which are-connected -by the Screw-threiulcd perforations S 8 with the upper surface of the jaw 5. in each of the couca-vities T T seated a presser-button i), having au upper surface corresponding to the shape of the concavity and a smooth lower surface. YThis hutten7 presser, or section" .l is furnished with a sere\vthrezuled stem l0, working iu ihc scre\\'-threaded pen foi-ation b and having au upper cud adapted to be engaged hy a tool to turn the stein l0, and thus elevate or depressI the hutten to adjust its bearing ouv the knife.

Then the various partsare assembled, the lower jaw il supports the knife-blade l2 and `the back plate iii. beth of which are ef the construction well known in this class of niachimes, the back plate i3 forming a rear abutment to prevent the rearward movement of the vknife when the leatheris brought against its edge. Above the knife and the back plate is mounted the upper jaw 5, provided with the adjuster-buttons J i), which are adjusted to bear 011 the upper surfaces of the knife and of the back plate, so that both are maintained in corresponding alinement and the knife is prevented from riding under the back plate. lfrom time to time the pressebuttons may he adjusted in accordance with any change of vibration in the knife and to reduce liusame.

IOC)

` Having ihus described my invention, I eiei'm ee new enddesire to secure by Lettersl Femm-l l. In a. knife-adjusting device for leather-- 65 eplitting machines, the combination with the' iewer jam' the knife, and the back plate, of he nppervjew having recesses, and independ emiy-edjusteblepressers contained Within .eei recesses and adapted to be adjusted to .m been on the knife and on the beek plete.

2.- The combination with 4the jaw 5 having the concavities 7 7 and the scre\\*-threaded perforations 8 8, and the buttons 9 9 seated in said eoncafvitiee and having the threaded stems 10 10 engaged in theperfomtons, of 15 the lower jaw ll, and the back Piate 13 and knife 12 supported thereby.

II. J. MILLER, A. E. DENISON. 

